Fastener for needle mounts



Q- E. HAENE$ FASTENER FOR NEEDLE MOUNTS V Filed April 5, 1926 Patented July 6, 1926.

1,591,762 PATENT OFFICE,

GEORGE E. HAINES, OF WATERTOWN, NEW YORK, ASSIGNOR T0 FAIGI-INEY INSTRU- MENT GOQ RPORATION, OF WATEBTOXVN, NEW YORK, A. CORPORATION OF NEW YORK.

FASTENER FOR NEEDLE MOUNTS.

Application filed April 3, 1926. Serial No. 99,544.

This invention relates to hypodermic and other syringes employing hollow needles, and has especial reference'to means for fastening the needle-mounts to the barrels of the syringes.

The object of the invention is to provide an extremely simple, eflicient and inexpensive adapter or coupling, comprising a single tubular thimble-like member, which may be permanently and concentrically mounted adjacent the tapered discharge tip, of an ordinary glass or metal syringe, the said adapter being formed with an elongated opening through which the tip of the barrel protrudes. A further object is to provide a needlemount having a tapered socket adapted to telescope said tip for effecting a pressure and liquid-tight joint between the barrel and the mount, the body of the needlemount containing the tapered socket having a diameter corresponding to the narrowest dimension of the opening in the adapter and said body being formed with oppositely facing circumferential flange portions, which together, with the body correspond to the broadest dimension of said opening, whereby when said flange portion of the body is inserted through the said opening, and then rotated in either direction, the said flange portions frictionally engage the inner wall of the adapter in the plane of the narrowest dimension of the said opening, thereby securely locking and preventing the needlemount from accidental loosening or release during a hypodermic operation.

I attain these objects by the means set forth in the detailed description which fol lows, and illustrated by the accompanying drawing, in which v Figure 1 is a side elevation of a hypodermic syringe, to which a needle-mount is securely fastened, by my improved adapter, the latter being shown in vertical longitudinal section. Fig. 2 is a vertical cross-section, taken on line 2-2 of Fig. 1; showing the interlocking of the needle-mount by means of the mutilated flangesthereof. Fig. 3 is a side elevation of the adapter. Fig. 4 is a front end view of the adapter. And Fig. 5 is respectively a broken side view and a rear end elevation of the needle-mount.

In the drawing, 2 represents the glass or metal barrel of the syringe, the head end of which is fitted with and partially enclosed by a ferrule 3, the latter being provided with the usual finger loops 3, by which the barrel .is held. 4 represents the usual plunger, which is operated by a stem 4', the latter being fitted with a thumb loop 4?, by which the plunger is reciprocated. The opposite end of the barrel 2 is usually formed with a tapered prolate or tip 2, to which the correspondingly tapered portion 5' of the detachable needle-mount 5 is telescopically applied, as shown in Fig. 1. The tip 2 and the socket 5 are usually carefully ground so as to effect the necessary pressure and liquid tight joint betwen said parts.

For ordinary external hypodermic work, the snug frictional contact of the needlemount and the tip is such that considerable rough handling is required to effect the accidental detachment of said parts. But for internal use, such as operations in the mouth and throat, it has been found necessary to provide means for positively fastening or looking the needle-mount to the barrel in order to obviate all danger of the needle being released and swallowed, or otherwise injuring or harming the patient. To this end, I provide an extremely simple and effective adapter or'coupling for securing the needle-mount, which will now be described:

6 represents a tubular thimble-like shell or sleeve, preferably made of relatively thin gauge metal, having a plain bore substantially equal to the diameter of the barrel 2, one end of the shell being open and clear and adapted to telescopically receive the portion of the barrel adjacent the tip 2', the shell 6 preferably being permanently held in place by cement, expanding solder, or by the well-known pressfit. The shell 6 preferably extends beyond the barrel proper and partially encloses .the tip 2, the free end of the shell being contracted by drawing or spinning, as shown in Figs. 1, 3 and 4, and the said end being formed with an oval-shaped or elliptical opening, as 6', through which the free end of the tip 2 protrudes (see Fig. 1.). The opening 6' is arranged to provide relatively broad confronting shoulders or lips 6", that lie in the plane of the narrowest dimension of the opening. 7 represents an ordinary hollow hypodermic needle, which is supported by a mount or holder 8, the latter comprising a cylindrical portion 8', and a tapered portion 8 which is bored out axially, as at 8*, to receive the needle 7. Beyond the needle-bore, the body 8 is formed with a tapered axial socket 8, the taper thereof, preferably corresponding exactly to the taper of the tip or prolate 2 for insuring a pressure-tight joint when the parts are assembled as in Fig. 1. The free end of the body portion 8 is preferably formed circumferentially with a flange 8 the said flange preferably being cut away or flattened at the opposite sides of the body, as at 8 see Figs. 1 and 5). The diameter of the body 8 i preferably substantially equal to the shotdimension of the opening 6' of the shell, shown in Figs. l, 2 and l, and when the parts are assembled as shown in Fig. 1, the body 8' is held substantially concentric to the shell by the shoulders or ledges 6 and the tip 2. and said body may be freely rotated in the said opening. The flange portions 8 being disposed at the opposite sides of thebody 8 give to the body 8 substantially the some shape and size, as the opening 6 (see end view in Fig. This enables the body S-9- to be inserted through the opening 6, and facilitates the positive locl jng of the mount to the shell by simply rotating the body 8 in either direction for elfecting the frictional engagement of flanges S with the confronting shoulders 6, as shown in Figs. 1 and 2. To properly apply the shell 6, the free end of the latter should be so positioned relatively to the free end of the tapered prolate 2 that when the flanges 8 of the needle-mount pass through the opening 6, as shown in Fig. 1, the prolate 2 and the socket 8 become snugly engaged and a certain amount of onward pressure as well as twisting force is necessary to effect the final locking engagement of the flanges 8 with the shoulders 6 When the parts are properly constructed, applied and adjusted, the frictional grip of the tip 2 and the socket 8 supplemented by the frictional contact of the flanges 8 with the shoulders 6*, obviates all danger of the needle-mount becoming loosened or detached, except by the operator employing the same amount of force required to apply the mount.

My needle-mount fastener comprising the one-part adapter 6 is extremely simple and may be produced and installed at slight expense. Owing to the peculiar construction and arrangement of the adapter, the needlemount 8 may be applied or removed without danger of breaking or otherwise injuring the relatively fragile prolate 2'. Furthermore, the attaching and detaching of the needle-mount may be effected by a single motion which start with a slight longitudin-al movement, and ends with a partial rotation of the needle-mount for engaging, or freeing the flanges 8 from the le lges (3".

Having thus described my invention, what I rlaim, is-

l. In a syringe, the combination with the barrel having a tapered tip. and a nccdle mount having a tapered socket to receive said tip and having a flange adjacent said socket, of an adapter comprising a tliiinblelilze body adapted to be permanently mounted on the barrel near the tapered tip and partially enclosing said tip. the free end of said body being contracted and being formed with an elliptical opening whose narrowest dimension substantially equals the diameter of the body of the needle-mount. the flange-portion of the needle-mount ha\'- ing a span substantially equal to the broadest dimension of the opening of the adapter, adapted when inserted through said openin; and rotated a partial turn to frictionallyeugage the end wall of the adapter in the plane of said narrowest dimension for preventing accidental loosening or release of the needle-mount.

52. In a hypodermic syringe, the combination with the barrel having a tapered extension at one end, and a needle-mount having a cylindrical body formed internally with a tapered socket adapted to rcccivc said extension, said body being formed externally with oppositely facing flange-portions which render the end of said body elliptical, of acoupling comprising a tubular body mounted on the barrel near the base of the extension, the free end of said coupling, being; contracted and being formed with an elliptical opening through which said extension protrndes concentrically, the narrowest dimension of said opening orresponding to the normal diameter of the needle-moimt, and said needle-mount adapted to be inserted through said opening and to be rotated for interlocl-zing said flangeportions with confronting shoulders of the adapter that form the margins of the narrowest dimension of said opening.

In testimony whereof I allix my sigi'iature.

GEORGE E. HAIN 

